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Old 04-28-2014, 06:30 PM   #1
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1976 25' Tradewind
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Help me verify tire spec please?

I am replacing all my tires on my 76 Tradewind, but I am tire ignorant. :/ I did read all the posts and decided to go with the Michelin LTX that a lot of people like. Question is do I have the right tire picked out and can I have them mounted on my existing rims and will the caps still fit? Is it a given or do I need to check something else on the existing tires, which say "Goodyear workhorse, 7.00-15LT, load range C"?
Thanks in advance.

http://www.tirerack.com/tires/tires....omCompare1=yes

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Old 04-28-2014, 06:46 PM   #2
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Quote:
Originally Posted by merrypaws View Post
I am replacing all my tires on my 76 Tradewind, but I am tire ignorant. :/ I did read all the posts and decided to go with the Michelin LTX that a lot of people like. Question is do I have the right tire picked out and can I have them mounted on my existing rims and will the caps still fit? Is it a given or do I need to check something else on the existing tires, which say "Goodyear workhorse, 7.00-15LT, load range C"?
Thanks in advance.

http://www.tirerack.com/tires/tires....omCompare1=yes

Attachment 210815
We still recommend the Goodyear Marathons.

The correct size for your Airstream is ST 225/75R15.

Load range "C" is ok, but if you have them in use now, on steel wheels, you cannot increase the rating to "D". If you do, the wheels will split.

Andy
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Old 04-28-2014, 06:58 PM   #3
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As long as the rim (wheel) is NOT changed the "caps" or wheel covers will fit after the tires are replaced.

As long as the rims (wheels) on your trailer are the original 15" in diameter rims, a 15" in diameter Michelin LTX tire (P235/75R15) will fit the old rim.
Data -
The P in the first part means the tire was designed for passenger vehicle applications. The 235 means the width of the tire. and the 75 means the side wall is 75% of the tread width. The 15 at the end means the tire fits 15" rim or wheel
applications. More readin about this can be found on that same site.

http://www.tirerack.com/tires/tirete....jsp?techid=46

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Old 04-28-2014, 07:09 PM   #4
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Also, because it's a P rated or Passenger tire, you also have to derate the load carrying capacity by 10% (which equates to 1984# per tire or a max load of 7936# for your tandem axle trailer). Have you weighed you trailer at the CAT scales?
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Old 04-28-2014, 07:24 PM   #5
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You should be fine with those tires.

Perry
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Old 04-28-2014, 07:32 PM   #6
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Those are the same tires I have on my 75 TradeWind. I have the aluminum wheels, but I believe they are the same size. The original tires on my trailer were 7.0 x 15 bias.

The new tires look great and tow well. I only have a few thousand miles on them, so far so good. I did notice that they don't run as warm as the bias tires and the pressure does not change as much when these tires get warm on the road. I run them at 50 psi cold.
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Old 04-28-2014, 07:39 PM   #7
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Great tires. I have been running them for 7 years and am on my second set. I have a 25' , 1988 Excella. It puts about 5500 lbs on the tires. With a load rating of almost 8000 lbs you should be fine with your 25' with lots of load carrying to spare.
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Old 04-28-2014, 07:50 PM   #8
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Thanks all, My dream would be lost without everyone's knowledge.
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Old 04-29-2014, 08:04 AM   #9
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Quote:
Originally Posted by Inland RV Center, In View Post

Load range "C" is ok, but if you have them in use now, on steel wheels, you cannot increase the rating to "D". If you do, the wheels will split.

Andy
Andy,
Are you saying I cannot use those Michelin tires if I have steel wheels? How do I know what the rating is on those tires? I have no idea if my rims are original or what metal they are. How can I tell?
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Old 04-29-2014, 08:28 AM   #10
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Andy,
Are you saying I cannot use those Michelin tires if I have steel wheels? How do I know what the rating is on those tires? I have no idea if my rims are original or what metal they are. How can I tell?
The tire load range rating, is on the tire.

The brand tire you use has nothing to do with the wheels.

History says, that a steel wheel can and will most likely fail, after many years of use, if the tire rating is increased from a "C" to a "D" rating.

Andy
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Old 04-29-2014, 08:42 AM   #11
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The 235/75-R15 tire only use 50 psi max so the pressure should not hurt the rim. If you use E rated trailer tires and inflate them to 80 psi you will over stress the rim. The older trailers came with C rated tires that were 45 psi max. You should be fine at 50 psi.

Perry
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